Rupert Grint recently spoke about what happened when Shia dropped acid for the film they're starring in together, The Necessary Death of Charlie Countryman, and it sounds like Shia was acting prettttty cray while on LSD.

The 25-year-old redhead stars as Cheetah Chrome in the rock-drama CBGB, about the legendary New York music venue and all the stars who came through it.

In the scene below, an inquisitive fan stops Rupert to ask if he dyes his hair or if he was born with that color. In order to prove that the fire up top is au naturale, Rupert shows her the fire down below, dropping trou and showing off his Hogwarts!